Visceral fat, subcutaneous fat, Prenuvo MRI scans, and the truth about belly fat
Your bad gut bacteria might be the reason your testosterone, your immune system, and even your sperm count are struggling, and most probiotics never survive long enough to fix it. This episode reveals which strains actually make it through your stomach acid alive, and what happens once they do.
Go To JustThriveHealth.com/asprey for a free 90 day supply of bitters with your next subscription.
Host Dave Asprey sits down with research microbiologist Kiran Krishnan, co-founder of Microbiome Labs, the leading microbiome therapeutics brand among healthcare professionals. He has published multiple peer-reviewed studies, holds global patents, and has spent 20 years building companies focused on the science of the microbiome. His work centers on spore-based probiotics, the rare strains proven to survive the stomach’s brutal acidity and actually rebuild the gut from the inside out.
Kiran and Dave break down why 98 percent of conventional probiotics die before they ever reach your gut, and why spore-forming bacteria are different. They dig into the "gelding effect," the well-documented pathway where endotoxins from bad gut bacteria shut down testosterone production and drive up cortisol, and how fixing your microbiome can reverse it. They cover the connection between endotoxemia and nearly every major marker of aging, metabolism, and inflammation, why butyrate acts like a natural GLP-1 for fat loss, how Akkermansia can upregulate mitochondria and improve blood sugar control, and the surprising role vitamin K2 plays in bone density and functional medicine. This is biohacking at the cellular level, using ancient biology, fasting-adjacent metabolic pathways, and precision supplementation to optimize human performance from the gut up.
You’ll Learn:
-Why 98 percent of probiotics die in your stomach before they ever work
-What the "gelding effect" is and how gut bacteria can shut down testosterone
-How endotoxins drive inflammation, cortisol, and accelerated aging
-Why butyrate functions like a natural, low-cost alternative to GLP-1 drugs
-How Akkermansia improves mitochondrial function and blood sugar control
-The overlooked link between your microbiome and vitamin K2 production
-Why spore-based probiotics can survive gastric acid when most others cannot
-How 90 days of gut repair can measurably reduce circulating endotoxins
Resources:
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– Show notes – ELITE Performance Coaching | If you’d like to discover where you may be addicted to struggle, allergic to success, and what may be standing between you and your next breakthrough, visit FastestChange.com
Timestamps:
00:00 – Trailer
00:38 – Kiran Intro
02:01 – Stomach Acid & Probiotics
05:25 – Fauci & Spore Bacteria
13:58 – Losing Gut Diversity
19:01 – How Butyrate Is Made
22:11 – Dave’s Personal Stack
24:00 – Quorum Sensing
31:26 – Endotoxins Explained
37:13 – Charcoal & Binders
39:41 – SIBO & Gut Bacteria
45:03 – Discovering Vitamin K2
49:33 – Gelding Effect & Testosterone
54:51 – Akkermansia & Weight Loss
01:02:17 – Role of Bitters
01:04:47 – Just Thrive Gift
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